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Ice and Permafrost
6
Snow
6
*ICE
3
*LANDING FIELDS
3
CONSTRUCTION
3
Civil Engineering
3
GLACIERS
3
Terminal Flight Facilities
3
*ANTARCTIC REGIONS
2
*CONSTRUCTION MATERIALS
2
*SNOW
2
AERIAL PHOTOGRAPHS
2
ANTARCTIC REGIONS
2
COLD REGIONS
2
DENSITY
2
EXCAVATION
2
LAND ICE
2
MAINTENANCE
2
MILLING MACHINES
2
PERMAFROST
2
POLAR CAP
2
POLAR REGIONS
2
RUNWAYS
2
SURVEYS
2
TRANSPORT AIRCRAFT
2
WHEELS
2
*AIRPORTS
1
*ARCHEOLOGY
1
*DAMS
1
*LANDFILLS
1
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Antarctic
4
Mill Glacier
3
McMurdo Station
2
Mount Howe
2
Patriot Hills
2
Transantarctic Mountains
2
Arctic
1
Austral
1
Casey Station
1
Gage
1
Greenland
1
Hampton
1
Ice Runway
1
Lechner
1
Mill Pond
1
Mount Lechner
1
Ross Ice Shelf
1
Ross Sea
1
Rosser Ridge
1
Salt River
1
South Pole
1
The Antarctic
1
Williams Field
1
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